As mentioned in last month's In The Loop, Tactical Tech has been working on a collaborative project with two sex worker collectives in India and Cambodia for the last two-and-a-half years. The aim of the project was to explore how community-based organisations can use data and evidence in their advocacy.  The first in a series of write-ups of the project is now up on Tactical Tech's website. It focuses specifically on one of the collectives, DMSC – a Calcutta-based forum of 65,000 sex workers -- and looks at not only what the DMSC collective did (in terms of collecting evidence for the project), but also at why the project worked, how the collective had to re-think some of its assumptions in the face of new evidence, and how this will impact their campaign activities in the future.